For racers running older XB series cars, the XRAY 358334 rear springs offer an easy way to refine rear-end feel. The 85mm matched pair aims to keep damping consistent so the chassis reacts predictably lap after lap.
Each spring is checked and paired to ensure even damping across both sides, helping to preserve neutral handling. The springs are slightly progressive but move toward a linear response under heavier compression, which improves control on mixed surfaces.
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